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Adjusting for fertility and competition in variety trials

Published online by Cambridge University Press:  25 April 2001

M. DURBAN ,
I. D. CURRIE  and
R. A. KEMPTON
M. DURBAN
Affiliation:
Biomathematics and Statistics Scotland, The King's Buildings, Edinburgh, EH9 3JZ, UK
I. D. CURRIE
Affiliation:
Department of Actuarial Mathematics and Statistics, Heriot-Watt University, Edinburgh, EH14 4AS, UK
R. A. KEMPTON
Affiliation:
Biomathematics and Statistics Scotland, The King's Buildings, Edinburgh, EH9 3JZ, UK
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Abstract

A joint model for plot yield in response to fertility trends and interplot competition is described. The model combines the mixed model representation of a cubic smoothing spline to model fertility and a regression model with auto-regressive terms to model competition. Estimation is based on a generalization of residual maximum likelihood. The methods were applied to a series of 70 sugar beet trials conducted by the Plant Breeding Institute, Cambridge, UK, and the results summarized.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 136 , Issue 2 , March 2001 , pp. 129 - 140
Copyright
© 2001 Cambridge University Press

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